Destroy and doc fixes to PanZoomBar. Fixes #592. Passes all tests.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2933 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/PanZoomBar.js

@@ -14,21 +14,53 @@ OpenLayers.Control.PanZoomBar.Y = 4;
 OpenLayers.Control.PanZoomBar.prototype = 
   OpenLayers.Class.inherit( OpenLayers.Control.PanZoom, {
 
-    /** @type Array(...) */
-    buttons: null,
-
     /** @type int */
     zoomStopWidth: 18,
 
     /** @type int */
     zoomStopHeight: 11,
 
+    /** @type DOMElement */
+    slider: null,
+
+    /** @type OpenLayers.Events */
+    sliderEvents: null,
+
+    /** @type DOMElement */
+    zoomBarDiv: null,
+
+    /** @type OpenLayers.Events */
+    divEvents: null,
+
     initialize: function() {
         OpenLayers.Control.PanZoom.prototype.initialize.apply(this, arguments);
         this.position = new OpenLayers.Pixel(OpenLayers.Control.PanZoomBar.X,
                                              OpenLayers.Control.PanZoomBar.Y);
     },
 
+    /**
+     * 
+     */
+    destroy: function() {
+
+        this.div.removeChild(this.slider);
+        this.slider = null;
+
+        this.sliderEvents.destroy();
+        this.sliderEvents = null;
+        
+        this.div.removeChild(this.zoombarDiv);
+        this.zoomBarDiv = null;
+
+        this.divEvents.destroy();
+        this.divEvents = null;
+
+        this.map.events.unregister("zoomend", this, this.moveZoomBar);
+        this.map.events.unregister("changebaselayer", this, this.redraw)
+
+        OpenLayers.Control.PanZoom.prototype.destroy.apply(this, arguments);
+    },
+    
     /**
      * @param {OpenLayers.Map} map
      */